Process of generating o-xylene-air mixtures for the production of phthalic anhydride

Abstract

Process for generating a homogeneous gas mixture of o-xylene and air for the production of phthalic anhydride wherein o-xylene is completely evaporated in the absence of oxygen, superheated and then mixed with air and supplied to a phthalic anhydride reactor.

1. A process for producing an o-xylene-air mixture for the production of phthalic anhydride, wherein o-xylene is completely evaporated in the absence of oxygen, superheated and then mixed with air; and the mixture supplied to a phthalic anhydride reactor. 
     
     
       2. The process of  claim 1 , wherein said evaporation is accomplished by heating the o-xylene in an evaporator. 
     
     
       3. The process of  claim 2 , wherein said evaporator is heated with steam from a steam accumulator. 
     
     
       4. The process of  claim 2 , wherein said evaporator is a natural-circulation evaporator or a kettle evaporator. 
     
     
       5. The process of  claim 1 , wherein the said o-xylene is mixed with said air in the amount of from 80 to 120 g o-xylene/Nm 3  of air. 
     
     
       6. The process of  claim 1 , wherein said o-xylene and said air are mixed by a sparger ring mixer.